How is this presented?

As an example: you have a policy set to deposit 50% of the total amount, if reservation is done 5 days prior to check-in, with a maximum of 6x installments:

When I choose the room assigned to it, fulfilling the rules of the policy, the amount to pay now will show accordingly.

Now, if the payment method chosen is the one assigned to the payment confirmation where instalments are applicable (Cielo or Redecard) the dropbox will be shown up to the number of instalments selected.

The reservation details will show on the notes the payment gateway information, plus the number of installments selected by the guest.

Should the policy not be 50%?

No. The rule set in the policy only applies if the guest selects "1x". Over 1x it splits the Total amount in the number of times selected.

For the same example, just "1x".

How can I see if a policy has installments set?

In view mode we can see if the policy has or not installments. If it doesn't it will state "1x".